This quiz works best with JavaScript enabled. Home > Cbse > Class 12 > Science > Chemistry Part I > Class 12 Chemistry (Part I) Chapter 3 Electrochemistry – Quiz 6 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Chemistry (Part I) Chapter 3 Electrochemistry Quiz 6 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. A first order reaction has a rate constant of 0.0051 min$^{-1}$. If we begin with 0.10 M concentration of the reactant, what concentration of reactant will remain in solution after 3 hours? A) .040M. B) .020. C) .30. D) None of the above. Show Answer Correct Answer: A) .040M. 2. A device used to measure the flow of current in a cell is the ..... A) Salt bridge. B) Voltmeter. C) Cathode. D) Anode. Show Answer Correct Answer: B) Voltmeter. 3. What is electrolytic conductivity? A) Ability of a solution to conduct electricity due to electrons. B) Ability of a solution to resist electricity. C) Ability of a solution to change color. D) Ability of a solution to conduct electricity due to the presence of ions. Show Answer Correct Answer: D) Ability of a solution to conduct electricity due to the presence of ions. 4. The voltmeter will not deflect when two identical metals are used in a chemical cell. //Voltmeter tidak akan terpesong apabila dua logam sama digunakan dalam sel kimia. A) True // Benar. B) False // Palsu. C) All the above. D) None of the above. Show Answer Correct Answer: A) True // Benar. 5. What is an electrochemical cell? A) An electrochemical cell is a device that converts chemical energy into electrical energy or vice versa. B) A type of battery that cannot be recharged. C) A device that only stores electrical energy. D) A machine that generates heat from chemical reactions. Show Answer Correct Answer: A) An electrochemical cell is a device that converts chemical energy into electrical energy or vice versa. 6. Free energy from a reaction is the amount of energy that is A) Available to do work. B) Equal to the enthalpy change. C) Absorbed by an entropy decreases. D) Wasted as heat. Show Answer Correct Answer: A) Available to do work. 7. In the zinc-copper voltaic cell, the cathode is labeled the ..... electrode. A) Negative. B) Positive. C) All the above. D) None of the above. Show Answer Correct Answer: B) Positive. 8. In which of the following pairs, both the ions are coloured in aqueous solutions?[Atomic no of Sc = 21, Ti = 22, Ni = 28, Co = 27, Cu = 29] A) Sc$^{3+}$, Ti. B) Sc$^{3+}$, Co$^{2+}$. C) Ni$^{2+}$, Cu$^{+}$. D) Ni$^{2+}$, Ti$^{3+}$. Show Answer Correct Answer: D) Ni$^{2+}$, Ti$^{3+}$. 9. In strong electrolytes, ..... % dissociation of ions takesplace. A) 70. B) 50. C) 80. D) 100. Show Answer Correct Answer: D) 100. 10. What is an electrochemical cell and its components? A) An electrochemical cell consists of two electrodes (anode and cathode), an electrolyte, and a separator. B) An electrochemical cell is made up of a resistor and a capacitor. C) An electrochemical cell has only one type of electrolyte. D) A battery consists of a single electrode and a conductor. Show Answer Correct Answer: A) An electrochemical cell consists of two electrodes (anode and cathode), an electrolyte, and a separator. 11. For a certain reaction aA $\rightarrow$ bB, the rate of reaction is doubled when the concentration of A is increased by four times. The rate ot reaction is equal to A) K[A]. B) K[A]$^{1/2}$. C) K[A]$^{1/a}$. D) K[A]$^{a}$. Show Answer Correct Answer: B) K[A]$^{1/2}$. 12. If an electrochemical reaction is spontaneous, what will E$_{cell}$ be? A) Positive. B) Negative. C) All the above. D) None of the above. Show Answer Correct Answer: A) Positive. 13. Which has more reduction potential A) Silver. B) Zinc. C) Hydrogen. D) Copper. Show Answer Correct Answer: A) Silver. 14. Determine the standard electrode potential for the reaction Zn(s) + Cu2+(aq) $\rightarrow$ Zn2+(aq) + Cu(s). A) -0.76 V. B) -1.98 V. C) +0.34 V. D) +1.44 V. Show Answer Correct Answer: D) +1.44 V. 15. For the given cell, Mg | Mg $^{2+}$|| Cu $^{2+}$|Cu A) Mg is cathode. B) Cu is the reducing agent. C) The cell reaction is Mg (s)+ Cu$^{2+ }$(aq)$\rightarrow$ Mg $^{2+ }$+ Cu. D) Cu is anode. Show Answer Correct Answer: C) The cell reaction is Mg (s)+ Cu$^{2+ }$(aq)$\rightarrow$ Mg $^{2+ }$+ Cu. 16. Which energy conversion shown below takes place in a galvanic cell? A) Mechanical to chemical. B) Chemical to electrical. C) Mechanical to electrical. D) Electrical to chemical. Show Answer Correct Answer: B) Chemical to electrical. 17. Ohm's law gives a relation between A) Current and temperature. B) Potential difference and current. C) Resistance and pressure. D) Pressure and potential difference. Show Answer Correct Answer: B) Potential difference and current. 18. If limiting molar conductivity of Ca$^{2+}$ and Cl$^{-}$ are 119.0 and 76.3 S cm$^{2}$ mol$^{-1}$, then the value of limiting molar conductivity of CaCl2 will be A) 271.6 S cm$^{2}$ mol$^{-1}$. B) 43.3 S cm$^{2}$ mol$^{-1}$. C) 314.3 S cm$^{2}$ mol$^{-1}$. D) 195.3 S cm$^{2}$ mol$^{-1}$. Show Answer Correct Answer: A) 271.6 S cm$^{2}$ mol$^{-1}$. 19. Zinc can be coated on iron to produce galvanized iron but the reverse is not possible. It is because A) Zinc has higher negative electrode potential than iron. B) Zinc has lower negative electrode potential than iron. C) Zinc has lower melting point than iron. D) Zinc is lighter than iron. Show Answer Correct Answer: A) Zinc has higher negative electrode potential than iron. 20. What is the role of the cathode in a galvanic cell? A) It connects the two half-cells. B) It is where reduction occurs. C) It generates electrical energy. D) It is where oxidation occurs. Show Answer Correct Answer: B) It is where reduction occurs. 21. Weak electrolytes theory was explained by? A) Wurtz. B) Kohlrausch's. C) Arrehenius. D) Debye Huckel. Show Answer Correct Answer: C) Arrehenius. 22. In electrochemical cell, oxidation takes place at A) Right. B) Left. C) Top. D) Bottom. Show Answer Correct Answer: B) Left. 23. Abnormal ion conductance is noted in A) OH-ions. B) Picrate ions. C) $^{Oxalate ions ions}$. D) Acetate ions. Show Answer Correct Answer: A) OH-ions. 24. What is a galvanic (voltaic) cell? A) It is a cell that destroys electrons on one side and creates electrons on the other side. B) It is a cell that contains only one metal bar and one aqueous ion solution. C) It is a type of battery that drives a redox reaction when electricity is applied. D) It is a type of battery that generates an electrical current from redox reactions. Show Answer Correct Answer: D) It is a type of battery that generates an electrical current from redox reactions. 25. A chemical species in an electrochemical reaction that LOSSES electrons undergoes ..... A) Oxidation Reaction. B) Reduction Reaction. C) All the above. D) None of the above. Show Answer Correct Answer: A) Oxidation Reaction. 26. Which of the following conditions would make the Nernst equation reduce to the standard cell potential equation? A) When the reaction quotient Q is 1. B) When the temperature is 0 Kelvin. C) When the concentration of all reactants and products is 1 M. D) When the pressure is 1 atm. Show Answer Correct Answer: C) When the concentration of all reactants and products is 1 M. 27. At anode which of the following reaction takes place A) Reduction. B) Non of these. C) Oxidation. D) Redox reaction. Show Answer Correct Answer: C) Oxidation. 28. Galvanic cells convert A) Mechanical energy in to electrical energy. B) Potential energy in to electrical energy. C) Chemical energy in to electrical energy. D) Electrical energy in to chemical energy. Show Answer Correct Answer: C) Chemical energy in to electrical energy. 29. Which of the following metals will react spontaneously with a solution containing iron ions? A) Al. B) Pb. C) Cu. D) Sn. Show Answer Correct Answer: A) Al. 30. Explain why the electrolyte has to be a aqueous or molten state A) So the ions can move. B) So the electrons can move. C) All the above. D) None of the above. Show Answer Correct Answer: A) So the ions can move. 31. Proses yang berlaku di anod ialah ..... A) Redoks. B) Elektrolisis. C) Penurunan. D) Pengoksidaan. Show Answer Correct Answer: D) Pengoksidaan. 32. The standard reduction potential of metals A, B, C and D are-0.40v, +0.34v, +0.8v and-1.67v. The metal that can displace all others is A) D. B) C. C) B. D) A. Show Answer Correct Answer: A) D. 33. Emf of the cell constructed by combining electrodes of Cd & Ag was measured to be 1.2 V at 298K. What is the electrode potential of Cd electrode if Standard electrode potential of Ag electrode is 0.8 V and it is in contact with 1M solution of AgNO$_{3.}$ A) -0.4V. B) 2V. C) -2V. D) 0.4V. Show Answer Correct Answer: A) -0.4V. 34. The product obtained at cathode after electrolysis of molten NaCl. A) Cl$_{2}$. B) Na. C) All the above. D) None of the above. Show Answer Correct Answer: B) Na. 35. Faraday's law of electrolysis is related to A) Atomic mass. B) Atomic number. C) Equivalent mass. D) Mobility of the anion and cation. Show Answer Correct Answer: C) Equivalent mass. 36. How does temperature affect the cell potential in electrochemical cells? A) Higher temperatures always decrease cell potential. B) Temperature has no effect on cell potential. C) Temperature affects cell potential by altering reaction rates and equilibrium constants, influencing the overall voltage output. D) Temperature only affects the physical size of the cell. Show Answer Correct Answer: C) Temperature affects cell potential by altering reaction rates and equilibrium constants, influencing the overall voltage output. 37. For the given cell, Mg|Mg$^{2+}$|| Cu$^{2+}$|Cu A) (ii) Cu is anode. B) (i) Mg is cathode. C) (iii) The cell reaction is Mg + Cu2+ $\rightarrow$ Mg2+ + Cu. D) (iv) Cu is the oxidising agent. Show Answer Correct Answer: C) (iii) The cell reaction is Mg + Cu2+ $\rightarrow$ Mg2+ + Cu. 38. What is electroplating? A) Put a key in liquid metal to turn it different colors. B) An aqueus compound being bonded. C) Using Table J to figure out which element is more oxidized. D) Using electricity to plate a substance with a metal. Show Answer Correct Answer: D) Using electricity to plate a substance with a metal. 39. Pick the CORRECT statement about S.H.E. A) S.H.E is used as a reference electrode to measure standard reduction potential of half-cell. B) S.H.E consists of a gold plate immersed in a basic solution. C) Standard reduction potential for S.H.E. is 1.00 V. D) Hydrogen gas at 1 atm and 0 $^\circ$C is pumped through S.H.E. Show Answer Correct Answer: A) S.H.E is used as a reference electrode to measure standard reduction potential of half-cell. 40. The ratio t$_{7/8}$:t$_{1/2}$ for the first order is A) 3. B) 5. C) 7. D) 2. Show Answer Correct Answer: A) 3. 41. Which of the following statements is true about electrolysis? A) It requires a spontaneous reaction. B) It converts electrical energy into chemical energy. C) It occurs in galvanic cells. D) It can only occur in liquid solutions. Show Answer Correct Answer: B) It converts electrical energy into chemical energy. 42. In electrolytic cell, anode electrode is connected to ..... A) Positive Terminal. B) Negative Terminal. C) All the above. D) None of the above. Show Answer Correct Answer: A) Positive Terminal. 43. All of the following statements concerning voltaic cells are true EXCEPT A) A salt bridge allows cations and anions to move between the half-cells. B) Electrons flow from the cathode to the anode in the external circuit. C) Oxidation occurs at the anode. D) A voltaic cell consists of two-half cells. Show Answer Correct Answer: B) Electrons flow from the cathode to the anode in the external circuit. 44. Species reduced in corrosion A) O$_{2}$. B) Fe. C) Mg. D) None of the above. Show Answer Correct Answer: A) O$_{2}$. 45. In a Galvanic Cell, the anode is ..... A) Positive. B) Negative. C) All the above. D) None of the above. Show Answer Correct Answer: B) Negative. 46. Naphthalene does not conduct electricity because it A) Consists of molecules which are uncharged particles. B) Has very low melting points. C) Contains ionic compounds which can dissolve in water. D) Contains freely moving electrons. Show Answer Correct Answer: A) Consists of molecules which are uncharged particles. 47. Which of the following is a component of the Nernst equation? A) Planck's constant. B) Faraday's constant. C) Boltzmann's constant. D) Avogadro's number. Show Answer Correct Answer: B) Faraday's constant. 48. True or false. Electroplating is a process whereby a metal surface is coated with a non-metal. A) False. B) True. C) All the above. D) None of the above. Show Answer Correct Answer: A) False. 49. What is a practical application of reverse electrochemical processes? A) Producing heat in furnaces. B) Cooling systems in refrigerators. C) Generating electricity in power plants. D) Metal plating in manufacturing. Show Answer Correct Answer: D) Metal plating in manufacturing. 50. Which statement is incorrect for lead storage battery A) 68% sulphuric acid by mass is used as electrolyte. B) Red lead oxide is used as cathode. C) Red lead oxide is used as anode. D) Spongy lead used as anode. Show Answer Correct Answer: C) Red lead oxide is used as anode. 51. The molar conductivity of a 1.5 M solution of an electrolyte is found to be 138.9 S cm2 mol-1. Calculate the conductivity of this solution. A) 0.30835 S cm-1. B) 0.30835 S cm-1. C) 0.20835 S cm-1. D) 0.21835 S cm-1. Show Answer Correct Answer: C) 0.20835 S cm-1. 52. Molten X is electrolysed using carbon electrodes. After 10 minutes, a brown solid is deposited on the cathode and a brown gas is released at the anode. What is molten X? A) Copper(II) bromide. B) Lead(II) chloride. C) Copper(II) chloride. D) Lead(II) bromide. Show Answer Correct Answer: A) Copper(II) bromide. 53. The standard potential of Galvanic cell is A) 1.5v. B) 1.2v. C) 1.35v. D) 1.1v. Show Answer Correct Answer: D) 1.1v. 54. Given the following cell:Zn | Zn$^{2+}$ || Sn$^{2+}$ | Snin order to increase the voltage, one could A) Increase [Zn$^{2+}$]. B) Use more Sn. C) Use more Zn. D) Increase [Sn$^{2+}$]. Show Answer Correct Answer: D) Increase [Sn$^{2+}$]. 55. When NaCl solution is electrolysed what has forms at the anode? A) Sodium. B) Hydrogen. C) Chlorine. D) Oxygen. Show Answer Correct Answer: C) Chlorine. 56. When an atom donates electrons, it becomes ..... A) A positive ion. B) A negative ion. C) A molecule. D) A neutral atom. Show Answer Correct Answer: A) A positive ion. 57. During electrolysis of aqueous NaCl, the product formed at cathode is A) Na metal. B) Cl2 gas. C) H2 gas. D) All of above. Show Answer Correct Answer: C) H2 gas. 58. Nernst equation for an electrode is based on the variation of electrode potential of an electrode with A) Temperature. B) Concentration of electrolyte. C) Both a & b. D) Density of the electrodes. Show Answer Correct Answer: B) Concentration of electrolyte. 59. Moving from top to bottom of the electrochemical series, the tendency to lose electrons: A) Increases. B) Decreases. C) Does not change. D) Increases and then decreases. Show Answer Correct Answer: B) Decreases. 60. Explain the concept of cell potential in electrochemical cells. A) Cell potential is the amount of charge stored in a battery. B) Cell potential is the resistance of the electrolyte in an electrochemical cell. C) Cell potential is the voltage difference between two half-cells in an electrochemical cell. D) Cell potential is the speed at which electrons flow through a circuit. Show Answer Correct Answer: C) Cell potential is the voltage difference between two half-cells in an electrochemical cell. ← PreviousNext →Related QuizzesScience QuizzesClass 12 QuizzesClass 12 Chemistry (Part I) Chapter 3 Electrochemistry Quiz 1Class 12 Chemistry (Part I) Chapter 3 Electrochemistry Quiz 2Class 12 Chemistry (Part I) Chapter 3 Electrochemistry Quiz 3Class 12 Chemistry (Part I) Chapter 3 Electrochemistry Quiz 4Class 12 Chemistry (Part I) Chapter 3 Electrochemistry Quiz 5Class 12 Chemistry (Part I) Chapter 3 Electrochemistry Quiz 7Class 12 Chemistry (Part I) Chapter 3 Electrochemistry Quiz 8Class 12 Chemistry (Part I) Chapter 3 Electrochemistry Quiz 9 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books